Balloon catheter, in particular for delivering drugs or stents in the region of a stenosis
First Claim
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1. A balloon catheter comprising:
- an outer shaft comprising a passage opening transverse to its length,an inner shaft,a balloon dilatable by a feedable pressure fluid through the outer shaft, wherein the proximal end of the balloon is attached to the outer shaft entirely distal to the passage opening to provide access to an intermediate space outside of the outer shaft without entering the balloon, further wherein the inner shaft protrudes from the outer shaft in a distal direction, anda cover sheath which is seated in a covering position over the passage opening and the balloon when the balloon is contracted, wherein during dilation of the balloon the cover sheath seals against both the outer shaft and the balloon in a pressure-tight manner and the balloon emerges from a front opening at a distal end of the cover sheath to displaceably guide the cover sheath along the outer shaft in a proximal direction via its front opening, thereby continuously releasing the dilating balloon from distal to proximal,wherein the intermediate space positioned between the cover sheath and the balloon communicates with a pressure fluid line to the balloon via the passage opening outside of the balloon.
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Abstract
A balloon catheter, in particular for delivering medicaments, stents or medicament-coated stents in the region of a stenosis, comprising
- an outer shaft (4)
- an inner shaft (6), and
- a balloon (7) at the distal catheter end, which balloon is dilatable by a feedable pressure fluid and which is attached with its proximal end (8) to the outer shaft (4) and with its distal end (9) to the inner shaft (6) which protrudes the outer shaft (4) in the distal direction,
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- a cover sheath (15) which is seated in a covering position over the contracted balloon (7) and is displaceably guided on the outer shaft (4) and which is displaceable on the outer shaft (4) in the proximal direction via its front opening (17) by the dilating balloon (7) while continuously releasing the same from distal to proximal.
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Citations
11 Claims
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1. A balloon catheter comprising:
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an outer shaft comprising a passage opening transverse to its length, an inner shaft, a balloon dilatable by a feedable pressure fluid through the outer shaft, wherein the proximal end of the balloon is attached to the outer shaft entirely distal to the passage opening to provide access to an intermediate space outside of the outer shaft without entering the balloon, further wherein the inner shaft protrudes from the outer shaft in a distal direction, and a cover sheath which is seated in a covering position over the passage opening and the balloon when the balloon is contracted, wherein during dilation of the balloon the cover sheath seals against both the outer shaft and the balloon in a pressure-tight manner and the balloon emerges from a front opening at a distal end of the cover sheath to displaceably guide the cover sheath along the outer shaft in a proximal direction via its front opening, thereby continuously releasing the dilating balloon from distal to proximal, wherein the intermediate space positioned between the cover sheath and the balloon communicates with a pressure fluid line to the balloon via the passage opening outside of the balloon. - View Dependent Claims (2, 4, 5, 6, 7)
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3. A balloon catheter loaded with a stent, comprising:
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an outer shaft comprising a passage opening transverse to its length, an inner shaft, a balloon dilatable by a feedable pressure fluid through the outer shaft, wherein the proximal end of the balloon is attached to the outer shaft entirely distal to the passage opening to provide access to an intermediate space outside of the outer shaft without entering the balloon, further wherein the inner shaft protrudes from the outer shaft in a distal direction, a cover sheath which is seated in a covering position over the passage opening and the balloon when the balloon is contracted, wherein during dilation of the balloon the balloon emerges from a front opening at a distal end of the cover sheath and displaceably guides the cover sheath along the outer shaft in a proximal direction via its front opening to continuously release the dilating balloon from distal to proximal, and a stent arranged on the balloon, which stent is retained in its contracted state enclosed by the cover sheath in the covering position of the latter and can be automatically released by the dilatation of the balloon while displacing the cover sheath at the same time in the proximal direction, wherein the intermediate space positioned between the cover sheath and the balloon communicates with a pressure fluid line to the balloon via the passage opening outside of the balloon. - View Dependent Claims (8, 9, 10, 11)
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Specification